Examine source code of Excel Export for ft.com

{
  "description": "Download excel file of financial data of equity fundamentals from ft.com",
  "manifest_version": 2,
  "name": "Export Financials as Excel",
  "version": "1.0",
  "homepage_url": "https://markets.ft.com",
  "icons": {
    "48": "icons/border-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://markets.ft.com/data/equities/tearsheet/financials*"
      ],
      "js": [
        "xlsx.full.min.js",
        "FileSaver.min.js",
        "script.js"
      ]
    }
  ]
}